Let me double check this is right before I start ordering 'bits' :-

Tank to Old Carb Fuel Pump...

Fuel Pump to Old Low Pressure Regulator...

Old Low Pressure Regulator to Swirl Pot...

Swirl Pot to New Injection Fuel Pump...

New Injection Fuel Pump to New High Pressure Regulator...

New High Pressure Fuel Pump to Fuel Rail....

Fuel Rail return to Swirl Pot.

Quick questions -

1. Do I really need 2 regulators?

2. Where about in the sequence should I place the Fuel Filter?

Cheers all

Scootz

Quick questions -

1. Do I really need 2 regulators?

2. Where about in the sequence should I place the Fuel Filter?

Cheers all

Scootz

Regulator goes after fuel rail, in return to swirl pot.

Cheers chaps... I knew I'd cocked up somewhere!

You don't need two regs as said.

To be honest it doesn't particularly matter where you put the filter. Crud should only be entering the system via the petrol pump(!) so as long as you've got a filter somewhere between the tank and the injectors you should be fine. That being said, injection filters screen better than some carb filters so I'd use an injection petrol filter after the high pressure pump...

Does this help.
Rescued attachment fuel inj.gif

You should have a return from the swirl pot to the tank as well.

Just 2 points

1 if you do not filter before high pressure pump you WILL be buying regular replacements. The tolerances on injection pumps are quite tight, one loose bit of crud from the tank can lock up the pump.

2 I have seen the internals of cheap plastic filters collapse under vacuum, make sure it is an injection filter.

Cheers
JohnW

Cheers guys.

Was just wondering about the need for a return from swirl pot to fuel tank - is this really necessary?

Found this diagram on the net.

Bit confused now as I always thought of a fuel rail as having a feed at one end and a return at the other...

Assuming the swirl pot / fuel pump were placed as recommended in this thread, then is this (diagram) perfectly acceptable?

LINKY-LINK

I would say no.....

With bikes where the fuel pump is mounted directly above the TB's (as is the fuel tank), it tends to be easier to regulate the fuel pressure...I think (but am not sure), the bike pumps can effectively keep a nice constant pressure...

However, If you are using a car fuel injection pump to pump fuel from the rear, then you will need a way of regulating the pressure...This is done with a 3 bar reg on the 'outlet' of the fuel rail...of course, this requires the excess fuel to go somewhere, and as previously mentioned, this is to the swirl pot.

So, your fuel system ideally looks like this:

tank > Inline filter > low pressure (lifter pump) > Swirl pot (top)> feed to High pressure pump > High pressure filter > fuel rail in > fuel rail out and straight into fuel pressure reg > back to swirl pot (top) > Swirl pot over flow > back to main tank


I'm doing a megasquirt conversion at the mo using GSXR 600 TB's......

My setup is just like that "returnless" diagram in the link.
My pump and reg are in the boot and works a treat.
I know of a few other cars that run like that as well.

New Mondeos don't have a return from the fuel rail either.

Paul.

[Edited on 14/11/07 by Doofus]

[Edited on 14/11/07 by Doofus]